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Not only was the 30 inch tube the largest B & W tube ever made, it was the first 90 degree deflection tube. At that time (1951), 50 degree tubes were common, and 70 degree tubes were just being introduced. DuMont was always a leader with large screen sets - they made 14 and 20 inch tubes for their prewar sets in 1939 and 40, much larger than the 5 to 12 inch tubes from their competitors.
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